1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3904d577850ae3d2d7e8a31cc2c03cc8b0187aa7139dacb532f9b192a717740. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e27767cd-1446-45d9-bec6-6dddba21b811.json and https://artists.proofprofile.net/proofs/artist/e27767cd-1446-45d9-bec6-6dddba21b811.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Оркестр Большого театра. Записи разных лет
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ff4b7b14e33aded0a9d11df3940f0fe10a7da9234da842e8e73fa28257e67c6. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21602937 — a six-check JSON result.
Prince Igor, Act II: Polovtsian Dance with Chorus "Uletay na krylyakh vetra"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c697e884e034d4d9b5caf38e57820a8e15b64493b7f602a67d7352c63e249b. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21602964 — a six-check JSON result.
Prince Igor, Prologue: Introduction "Solntsu krasnomu slava!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x872d4b8d321f28fa0d88bfdd2e9b936d51a12a65a0960b07426ab3624f039b0e. Chain 2 (Bitcoin): anchored in block 960231 (2026-07-30T08:33:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21602938 — a six-check JSON result.
Prince Igor, Act II: Chorus of the Polovtsian Maidens "Na bezvode"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb1cde1fd60ac4c95c532f85c7764deba01a64f5981cd3cb0f540ac52e90b4a6. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21602953 — a six-check JSON result.
Prince Igor, Act II: Dance of the Polovtsian Maidens
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbcfb337f3c36f782b9916a0a73b39f266598eb6d344a2478055aadcfc3bcb97. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21602954 — a six-check JSON result.
Prince Igor, Act II: Polovtsian Dance with Chorus "Poyte pesni slavy khanu!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe980817ecb4ad8b67a093767c356ea698630eb88777e68934bbf7d5f798300a3. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21602965 — a six-check JSON result.
Prince Igor, Act II: Polovtsian Dance with Chorus "Slavoy dedam raven khan"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8fa8cf742f15d5658e605dfb36f3604e58259689bac1725767e44edbc1b36b8. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21602966 — a six-check JSON result.
Prince Igor, Prologue: Introduction "Idem na bran s vragom Rusi!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e5cfbc24c0f97912653f583196da27d37ae66222383ad9b7f28008c130364b9. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21602939 — a six-check JSON result.
Prince Igor, Prologue: Introduction "Knyzya, pora nam vystupat"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8143cfe3cfbd96685a35ed87c14cd99c2d08cb6879fc47d56ca3aabcf7db6c54. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21602940 — a six-check JSON result.
Prince Igor, Prologue: Introduction "Pust pridut knyagini i boyaryni"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa7fa77229a46165d137faa7474aa34f75da7a3f602aa82706f55e479e62de32. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21602941 — a six-check JSON result.
Prince Igor, Act I Scene 1: Chorus "Goy! Slava! Slava Volodimiru"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x734024137ebba1e812310344678184ae3aecdee60b260a3d96cc3cccc32cd78f. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21602942 — a six-check JSON result.
Prince Igor, Act I Scene 1: Vladimir Galitsky's Song "Greshno tait"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf9f007a21fd02cf5a894c5bd5062883ff583bd03c902f9b991616bb83635254. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21602943 — a six-check JSON result.
Prince Igor, Act I Scene 1: Chorus and Scene "Oy, likhonko!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa764a0d47f59a3f1126478be74cc6fc101d158e2fcdaeb5e1c63f348056a9fc0. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21602945 — a six-check JSON result.
Prince Igor, Act I Scene 2: Yaroslavna's Arioso "Nemalo vremeni proshlo"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24ac04eec862588d15ab6119f9c3000c81042a38cd20900b2908b5941d3d0b74. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21602949 — a six-check JSON result.
Prince Igor, Act I Scene 2: Yaroslavna and Maidens Scene "Tam devushki prishli"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bdd85fb3e3f2643c81b6f03971c1f0e61fc2bb1c0f851041c75b97169a3d21e. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21602950 — a six-check JSON result.
Prince Igor, Act I Scene 1: Recitative "Knyazyu Galitskomu slava!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c53383720d0cf854919ffa2947a88ac67ae16c3a51eab53490f89611d9dd206. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21602944 — a six-check JSON result.
Prince Igor, Act I Scene 1: Scene "Stoy, rebyata, slukhay!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc81da8b3f6ea8ee4ea6ca6e8dcec2264869653497f2b4810858449aa86794fc. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21602946 — a six-check JSON result.
Prince Igor, Act I Scene 1: "Chto u knyazya da Volodimira"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc68774949825bae90f21ad049586d3f4ed16ed3f4f5f60d4502c1645132fc000. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21602947 — a six-check JSON result.
Prince Igor, Act I Scene 1: "Da, vot komu by knyazhit na Putivle!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x908fa573088265047e6060d99342adc0dbd1d68f172c87c33f5bd02ac407dc2a. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21602948 — a six-check JSON result.